#include <iostream>
#include <string>
using namespace std;
int a[26];
int b[26];

int main() {
  string A, B;
  bool is_same = true;
  cin >> A >> B;
  for (auto& c : A) a[c-'a']++;
  for (auto& c : B) b[c-'a']++;
  for (size_t i = 0; i < 26; i++) {
    if (a[i] != b[i]) {
      is_same = false;
    }
  }
  if (is_same) {
    cout << "YES" << endl;
  } else {
     cout << "NO" << endl;
  }
}